Pipe made of synthetic resin having a plurality of internal tubes
View Patent ↗The present invention relates to a pipe made of synthetic resin having a plurality of internal tubes, wherein silicone coating layers are formed on the respective inner circumferential surfaces of the plurality of internal tubes which are accommodated in an external tube, such that long optical fibers or electrical wires or the like inserted in the same can be readily and easily accommodated while water repellency is maintained, and failure to fuse or deformation of any of the side surfaces of the internal tubes, which are fused to the inner circumferential surface of the external tube, can be prevented when the internal tubes are formed integrally on the external tube, and the plurality of internal tubes can be stably inserted into and joined by fusing onto the inner circumferential surface of the external tube, and deformation due to temperature differences between the external tube and the internal tubes during cooling can be prevented while the internal tubes are inserted into and joined by fusing onto the inner circumferential surface of the external tube in a hermetic state.
1. A pipe comprising:
an external tube having a cylindrical shape;
a plurality of internal tubes, each internal tube having a cylindrical shape and disposed on an inner circumferential surface of the external tube at equal spaces;
a first silicon coating layer formed on an inner circumference surface of each of the plurality of internal tubes; and
an elastic connecting part disposed in a center portion of the external tube along a whole length of the external tube and including
as many supporters as the number of the internal tubes, each of the supporters having a long narrow plate shape and being arranged in a radial manner at equal angles, said each of the supporters having a first side fixed to the outer circumferential surface of corresponding one of the internal tubes along a whole length of the corresponding one of the internal tubes and a second side integrated with second sides of other supporters in a center of the external tube, whereby said each of the supporters elastically supports the corresponding one of the internal tubes, wherein the supporters have the same width from the first side to the second side with each other.
2. A pipe as claimed in claim 1 , wherein a thickness (t) of each of the supporters of the elastic connecting part is less than that of said each of the plurality of internal tubes.
3. A pipe as claimed in claim 2 , wherein the thickness (t) is 0.6˜0.8 mm.
4. A pipe as claimed in claim 1 , wherein said each of the plurality of internal tubes has corrugations having a mountain portion and a valley portion.
5. A pipe as claimed in claim 4 , wherein a rounding portion is formed in the mountain portion.
6. A pipe as claimed in claim 5 , wherein the rounding portion is coated by a second silicon layer, so that the second silicon layer is fused and coupled to the inner circumference surface of the external tube.